You say "sanitation aside", but that's the issue right there. Taping the probe to the side of the fermentation vessel, insulated from the air temperature with some kind of foam, will report temperatures as accurately as you need, without any added possibility of infection.
Primary: RIS 1.1
Bottled: RIS (黑墨), I Can't Believe It's Not Bitter! IPA, Caramel Amber Ale 1.1, Osmanthus and Sichuan Pepper Saison (桂花花椒赛森), 米酒 (rice wine)
Coming Up: Imperial CDA, I Can't Believe It's Not Bitter! IPA 1.1